In a method of producing an anti-microbial extract, gesho matter is ground to a medium coarseness to form gesho particles. An amount of ethanol sufficient to dissolve a predetermined amount of soluble gesho material is added to the gesho particles. The ethanol and gesho particles are agitated sufficiently to maintain the gesho particles in suspension for a predetermined amount of time, thereby generating a gesho extract/ethanol solution. The gesho extract/ethanol solution is vacuum filtered after the agitating step, thereby separating the gesho extract/ethanol solution from the gesho particles. The gesho extract/ethanol solution is concentrated so as to generate a viscous gesho liquid. The viscous gesho liquid is vacuum dried until the anti-microbial extract has a predetermined dryness. A drink includes a carbonated beverage dispensed in a bottle and an amount of gesho extract sufficient to act as a preservative of the drink.
